有一题逻辑问题跟同学讨论很久，还是无法理解答案跟题目关联性 题目: Police found that ninety percent of the burglaries and attempted burglaries ov er a five-year period in the city of Crowther occured in houses that did not h ave burglar alarm system. The police concluded that, in Crowther, the presence of a burglar alarm system is usually effective as a deterrent to burglary. The conclusion reached by the police presupposes which of the following? (A) The burglars entered houses only when they thought the occupants were away or asleep. (B)The burglars entered houses that had burglar alarm systems only when they a nticipated finding particularly valuable goods. (C) When they entered a house that had no burglar alarm system, the burglars c ould take more time to search for valuables. (D) Before they entered a house, the burglars could usually tell whether or no t it had a burglar alarm system. (E) The difference in the burglary rate between houses that had burglar alarm systems and those that did not have remained constant during the five-year per iod 答案是(C)，可是我们觉得(D)的答案比较有关联性，有请大家帮忙解答了。谢谢 -- Sent from my Android --

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